18191718380 has 36 divisors (see below), whose sum is σ = 41991302640. Its totient is φ = 6615169440.

The previous prime is 18191718353. The next prime is 18191718383. The reversal of 18191718380 is 8381719181.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (18191718383) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3756200 + ... + 3761039.

Almost surely, 2^18191718380 is an apocalyptic number.

18191718380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18191718380 is an abundant number, since it is smaller than the sum of its proper divisors (23799584260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18191718380 is a wasteful number, since it uses less digits than its factorization.

18191718380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7517270 (or 7517257 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 47.

The spelling of 18191718380 in words is "eighteen billion, one hundred ninety-one million, seven hundred eighteen thousand, three hundred eighty".